RMI

//+------------------------------------------------------------------+
//|                                                          RMI.mq4 |
//|                                 Copyright © 2006, DaVinciProject |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2006, DaVinciProject"
#property link      "http://www.metaquotes.net"

#property indicator_separate_window
#property indicator_buffers 1
#property indicator_color1 DodgerBlue
#property indicator_level1 15
#property indicator_level2 85
//---- input parameters
extern int RMIPeriod=5;
extern int Shift=5;
//---- buffers
double RMIBuffer[];
double PosBuffer[];
double NegBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   string short_name;
//---- 2 additional buffers are used for counting.
   IndicatorBuffers(3);
   SetIndexBuffer(1,PosBuffer);
   SetIndexBuffer(2,NegBuffer);
//---- indicator line
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,RMIBuffer);
//---- name for DataWindow and indicator subwindow label
   short_name="RMI("+RMIPeriod+")";
   IndicatorShortName(short_name);
   SetIndexLabel(0,short_name);
//----
   SetIndexDrawBegin(0,RMIPeriod);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| RMI - Relative Momentum Index                                    |
//+------------------------------------------------------------------+
int start()
  {
   int    i,counted_bars=IndicatorCounted();
   double rel,negative,positive;
//----
   if(Bars<=RMIPeriod) return(0);
//---- initial zero
   if(counted_bars<1)
      for(i=1;i<=RMIPeriod;i++) RMIBuffer[Bars-i]=0.0;
//----
   i=Bars-RMIPeriod-1;
   if(counted_bars>=RMIPeriod) i=Bars-counted_bars-1;
   while(i>=0)
     {
      double sumn=0.0,sump=0.0;
      if(i==Bars-RMIPeriod-1)
        {
         int k=Bars-2;
         //---- initial accumulation
         while(k>=i)
           {
            rel=Close[k]-Close[k+Shift];
            if(rel>0) sump+=rel;
            else      sumn-=rel;
            k--;
           }
         positive=sump/RMIPeriod;
         negative=sumn/RMIPeriod;
        }
      else
        {
         //---- simple moving average
         rel=Close[i]-Close[i+Shift];
         if(rel>0) sump=rel;
         else      sumn=-rel;
         positive=(PosBuffer[i+1]*(RMIPeriod-1)+sump)/RMIPeriod;
         negative=(NegBuffer[i+1]*(RMIPeriod-1)+sumn)/RMIPeriod;
        }
      PosBuffer[i]=positive;
      NegBuffer[i]=negative;
      if(negative==0.0) RMIBuffer[i]=0.0;
      else RMIBuffer[i]=100.0*positive/(positive+negative);
      i--;
}         
//----
   return(0);
  }
//+------------------------------------------------------------------+